造船工业。救火水管。双铰链卷盘。
Lewin教授利用橡胶水管、有孔的木盒、金属盘以及其它自制的装置来示范物体如何发声。
Walter Lewin USES rubber hose, wooden boxes with holes, metal plates and an assortment of other home-made instruments to demonstrate how objects produce sound.
分层注水管柱有效率低一直是困扰临盘油田开发生产的一大难题。
Low separate flooding string efficiency is one of the main problems in the exploitation of the Lin-pan Oilfield.
分层注水管柱有效率低一直是困扰临盘油田开发生产的一大难题。
Low separate flooding string efficiency is one of the main problems in the exploitation of the Lin-pan Oilfield.
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